15Integration3perPage (2).pdf - Focus of Chapter 15 Pathways \u2022 Pathway defined set of nerves nuclei and tracts taken by an impulse \u2022 Sensory

15Integration3perPage (2).pdf - Focus of Chapter 15...

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5/21/19 1 Focus of Chapter 15: Pathways Pathway defined: set of nerves, nuclei, and tracts taken by an impulse Sensory Pathways Somatic Motor Pathways Autonomic (visceral) Motor pathways- Chapter 16 Sensory receptors are connected to the CNS Impulses sent to CNS are – filtered at thalamus – projected to cerebral cortex Sensation: arriving information Perception: conscious awareness of sensation Transduction: conversion of stimulus to an action potential Sensory pathways Types – Somatic sensory pathways Visceral sensory pathways Origins: receptors Destinations: – Somatic sensory pathways Primary sensory cortex • Cerebellum – Visceral sensory pathways • Brainstem • Diencephalon
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5/21/19 2 Labeled line Sensory impulses travel along a labeled line – a link between receptor and a cortical neuron in cerebrum Carry one modality – Pain, cold, etc. Use this idea to understand – Phantom limb pain later L in e d raw in g o f th e p ain sy stem b y L o u is L a F o rg e, 1 6 0 0 ’s Interpretation of sensory information Axons are organized in bundles with specific origins and destinations Where a stimulus arrives on sensory cortex determines its perceived location Frequency of action potentials determines intensity of stimulus Organization of Somatic Sensory Pathways Sensory pathways consist of 3 neurons First order neuron Second order neuron *Third order neuron; * n o t a lw a y s p r e s e n t – Labeled line Axon collaterals may exist Not pictured send impulses to cerebellum, reticular formation, etc.
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  • Spring '18
  • Mark Bolke
  • Corticospinal tract, Visceral Sensory Pathways

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